HTC’s VP of Product Management, Mo Versi, tweeted about the Marshmallow update for HTC One (M9) on Sprint. His tweet read “HTC One (M9) Sprint owners, the Marshmallow OS has been approved ! OTA will start tomorrow morning. Thanks!“. The Marshmallow update will be rolled-out OTA (over-the-air) to the users of One (M9) on Sprint.

As visible in the image above, the support page for One (M9) on Sprint’s website states that the Android 6.0 Marshmallow update will carry version number 3.41.651.3. If you haven’t received a notification on your Sprint HTC One (M9) prompting you to update to Marshmallow, you can always check for the update manually.